Centrifugal pulp-drying machine



R. C. MABRY.' CENTRIFUGAL PULP DRYING MACHINE.

APPLICATION HLED APR. 23. 1921. 1,415,939.

Patented my 16,1922.

2 SHEETS-SHEET 1.

INVENTOR I} ATTORNEY.

R. C. MABRY. I CENTRIFUGAL PULP DRYING MACHINE.

AFPLICATION FILED APR. 2B. 1921. May 16 2 SHEETSSHEET 2.

INV EN TOR.

i from other cent or more. Up to about five per cent o'l UNITED STATES PATENT OFFICE.

nnxnoan 0. Manny, or NAsnuA, new HAi/rrsnmn GENTRIFUGAL PULP-DRYING- MACHINE.

To all whom it may concern:

Beit known thatl, Rumour) (l. MABRY, a

citizen oi. the United; States, residing at Nashua, in the county of Hillsborough and. State of New Hampshire, have invented certain new and useful Improvements in Centrifugal Pulp-Drying Machines, of which thefollowing is a, specification.

My invention relatesto centrifugal drying or separating machines, and is particularly adapted for use in removing the water from wood pulp.

It can also be usedtor removing water materials of a similar consistency. l i For thepurpose of storing and bleaching and for thickening for other purposes, it is desirable to reduce the amount of water or increase the percentage of solids from about one-tenth ofone percent to five per solids the material flows like a liquid, but when the percentage of solids increases to fifteen or more per cent, the material becomes about the consistency of oatmeal and is more troublesome to handle. -1 My machine is intended to remove the water, or. reduce the pulp as it is called, and will operate up to ten or eighteen per cent. I l i be water which comes from my lIltKililI'lG is also clearer, indicatint; that less of the solids have escaped. and my operation is a relatively gentle filtering and squeezing which does not injure the :pulp, while at the same time it is not necessary to run my one chine at as high speed as neoessary with. Variousother machines for a similar pur pose.

In the drawings, A represents a tank or water receiver, preferably of cylindrical form, with a base 12 shown as-supported by legs 10 on a floor B.

At the center of base plate 12 is a pulp Specification of Letters Patent. Patented May 16, Application fihedApril 28, 1921. Serial N0. 465,192.

outlet C around which is a depending flange l3, and atD is shown a water outlet around which is a depending flange 14:. t

11 :1 cylindrical outer sbellofthe water receiver A, and at the :top is shown an annular inwardly projecting flange 15 which leaves a relatively large opening 16 at the top.

F represents a hollow annular hub through which is a passage 20 which registers with and forms part oi? the pulp outlet C. Hub F is fastened to base .12 by means of bolts 21. and is shown as provided with anannular exterior pocket 22 in which are carricdcthe bearings 23 which support annular flanges 44 of screen H.

Thisscreen H is of cone shape with its large end at the top and itsoutlet lilwhich registers with outlet C at the bottom. It comprises a base eflhaving amlcpending flange 4.3 which extends down inside the part 20 of hub F and has in. it outlet K. Base 42 extends outwardly, and under its outer rim hasteeth 45 which engage a gear 64; carried' by shaft 60, supported in bearings, 62 and 63, which carries the drive pulley 61, altogetherforniing the means for rotating screen H indicated generally by O. i

Screen H is built up oftheribs lo which support the screen sections ll made oi any ioraminous material with holes or meshes a size suitable for use withthe material. to be operated on.

At the top, ribs 40 :1 re connected together by means 0'! an annular plate 56 which is 'ire'l erably bent downward at 53 to help iorn'i part of theoutlet oi" the feed hopper L.

. This feed hopper L is preferablyof an nular form and includes an annular up wvar'dly extending cylinder 50 from which extends outwardly the annular flange 51 to a point slightly b elow the bottom of 53, thus forming an annular outlet 54. 51 is attached to 53 by means of suitable brackets 52.,

I}, G represent one, or preferably two or more suitable fced inlets which deliver the stock into the annular hopper L preferably at different points. i, This stock is therefore delivered by hopper, L through its annular outlet 54 proximate the top rim oif screen H.

As screen H and hopper L revolve at a high rate of speed, the tendency of centridevice will work without the use of the,

clearin member which I will now describe, but I nd it works to better advantage and reduces the stock to greater thickness by its use. r

The bar 70 extends across the top 15 of shell A and is fixed in position, and from this depends a supporting rod 71 for the station ary member P.

From the bottom of rod 71 extends horizontally an arm 73, and from this, upwardly proximate the conoidal inner surface of the screen, extends the cleaning rod 74z. This is preferably such a distance from the surface of the screen that as the stock is carried around it will be picked up and rolled over the rod. This rod is supported at the top by an arm 72 and preferably extends upward at the top and over towards the direction from whichthe stock'comes at ,7 6.

As a part of the stationary member, I prefer also to use a compression guide plate 75 which extends outwardly from support 71 proximate cleaning rod 74: and serves to hold back the stock and thereby to compress it, and to direct it downward so that it will flow out from the outlet K through C to the point of delivery. This plate 75 may be set vertically or at a slight angle as desired.

Preferably, extending outwardly at a reverse angle, I also'use the wings M, each I attached to a rib whereby there is a tendwill move gradually from the tom 'ofthe revolving cone.

,ency to create a vacuum outside the screen as it revolves, thus helping to force the stock through the screen sections 41. 1

As shown in Fig. 5, instead of a feed hopper revoluble with the screen and having an annular outlet, I can "use one or more pipes Gr,G provided with nozzles 80, arranged to direct the stock against the upper inner part of the screen K.

I can also omit the wings M and the plate 75.

I may also adjust the stationary member P up or down or to the right or left by loosening set screw 77, as shown by the dotted lines, and I may make thearms 7 2 and 73 adjustable on rod 71 by means of collars 92 and 93 by which they are attached to 71 adjustably by set'screws 94:, 95. i

It is obvious that I can lift and turn stationary member P so that it will be practicall'youtof action, or that I may remo've it entirely. In such case, particularlyfif the nozzles 80, 80are used,the speed of the ma chlne should be so adjusted that gravity will overbalance centrifig'al force and the stock top to the bot- I-claimza'c'entrifugal machine for extracting liquid from paper pulp, the combination of a cone shaped screen with its large end at the top and its outlet at the bottom; and means for rotating said screen; with an an nular feed hopper revoluble therewith having an annular outlet proximate the top rim of the screen; and a stationary member in cluding a cleaning rod which extends proximate the conoidal inner surface of the screen and a compression guide plate proximate said rod and so set as to direct the thickened stock towards the outlet; together with wings extending outwardly and at an angle from the screen; and a water receiver which extends outside the screen and wings.

2. In a centrifugal machine for extracting liquid from paper pulp, the combination of of a cone shaped screen with its large end at a the top and its outlet at the bottom; and

means for rotating said screen; with an annular feed hopper revoluble therewith having an annular outlet proximate the top rim of the screen; and a stationary member ineluding a cleaning rod which extends proximate the conoidal inner surface of the screen and a compression guide plate proximate said rod and so set as to direct the thickened stock towards the outlet.

3. In a centrifugal machine for extracting liquid from paper pulp, the combination of a cone shaped screen with its large end at the top and its outlet at the bottom; and means for rotating the said screen; with a feed hopper arranged to deliver stock proximate the top rim of the screen; and a stationary member including a cleaning rod which extends proximate the conoidal inner surface of the screen.

4:. In a centrifugal machine for extracting liquid from paper pulp, the combination of a cone shaped screen with its large end at the top and its outlet at the bottom; and means for rotating the said screen; with feeding means arranged to deliver stock proximate the top rim of the screen; and a stationary member including a cleaning rod which extends proximate the conoidal inner surface of the screen.

5. In a centrifugal machine for extracting liquid from paper pulp and the like, the combination of a cone shaped screen with its large end at the top and its outlet at the bot tom; and means for rotating said screen; with feeding means arranged to deliver stock proximate the top rim of the screen; and an adjustable stationary member including a cleaning rod which extends proximate the conoidal inner surface of the screen.

REXFORD C. MABRY. 

